*{
    padding: 0;
    margin: 0;
}
.main{
    max-width: 640px;
    height: 25rem;
    margin: 0 auto;
    background-color: white;
}
.top{
    width: 100%;
    height: 3rem;
    float: left;
}
.left{
    width: 2rem;
    height: 2rem;
    float: left;
    margin-top:0.7rem;
    margin-left: 0.7rem;
    background-color:white;
}
.right{
    width: 8rem;
    height: 2rem;
    float: left;
    margin-top:0.7rem;
    margin-left:1rem;
    background-color: white;
}
.top_left{
    width:40%;
    height:0.4rem;
    float: left;
    text-align: left;
    border-bottom:1px solid #dfe1de;
}
.top_center{
    width:20%;
    height:0.8rem;
    float: left;
    font-size: 0.5rem;
    text-align: center;
    line-height: 0.8rem;
}
.top_right{
    width:40%;
    height:0.4rem;
    float: right;
    border-bottom:1px solid #dfe1de;
}
.open{
    width: 60%;
    height: 0.8rem;
    float: left;
    text-align: center;
    line-height: 0.8rem;
    font-size: 0.48rem;
    margin-left: 20%;
    margin-top: 1rem;
    border-radius: 18px;
    border: 1px solid  #4d4d4d;
}
.tree{
    width: 100%;
    height: 0.5rem;
    float: left;
    line-height:0.5rem;
    text-indent: 0.5rem;
    font-size: 0.55rem;
    margin-top: 2rem;
}
.trees{
    width: 100%;
    height: 4rem;
    float: left;
    text-indent: 0.5rem;
    font-size: 0.55rem;
    margin-top: 0.3rem;
    background-color:pink;
}
.button_tc{
    width: 100%;
    height: 11rem;
    float: left;
    margin-top: 0.6rem;
    background-color: #959595;
}
.button_1{
    width: 100%;
    height: 1.5rem;
    float: left;
    line-height: 1.5rem;
    font-size: 0.55rem;
}
.button_2{
    width: 100%;
    height: 1.5rem;
    float: left;
    line-height: 1.5rem;
    font-size: 0.55rem;
    margin-top: 0.35rem;
}
.button_21{
    width: 40%;
    height: 1.5rem;
    float: left;
    line-height: 1.5rem;
    font-size: 0.55rem;
    text-indent: 0.2rem;
}
.button_22{
    width: 27%;
    height: 1.5rem;
    float: left;
    font-size: 0.55rem;
    text-align: center;
    margin-left: 0.2rem;
    border: 1px solid ;
}